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# ZFS Pools


<img src="https://netdata.cloud/img/filesystem.svg" width="150"/>


Plugin: go.d.plugin
Module: zfspool

<img src="https://img.shields.io/badge/maintained%20by-Netdata-%2300ab44" />

## Overview

This collector monitors the health and space usage of ZFS pools using the command line tool [zpool](https://openzfs.github.io/openzfs-docs/man/master/8/zpool-list.8.html).




This collector is only supported on the following platforms:

- Linux
- BSD

This collector only supports collecting metrics from a single instance of this integration.


### Default Behavior

#### Auto-Detection

This integration doesn't support auto-detection.

#### Limits

The default configuration for this integration does not impose any limits on data collection.

#### Performance Impact

The default configuration for this integration is not expected to impose a significant performance impact on the system.

## Metrics

Metrics grouped by *scope*.

The scope defines the instance that the metric belongs to. An instance is uniquely identified by a set of labels.



### Per zfs pool

These metrics refer to the ZFS pool.

Labels:

| Label      | Description     |
|:-----------|:----------------|
| pool | Zpool name |

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| zfspool.pool_space_utilization | utilization | % |
| zfspool.pool_space_usage | free, used | bytes |
| zfspool.pool_fragmentation | fragmentation | % |
| zfspool.pool_health_state | online, degraded, faulted, offline, unavail, removed, suspended | state |

### Per zfs pool vdev

These metrics refer to the ZFS pool virtual device.

Labels:

| Label      | Description     |
|:-----------|:----------------|
| pool | Zpool name |
| vdev | Unique identifier for a virtual device (vdev) within a ZFS pool. |

Metrics:

| Metric | Dimensions | Unit |
|:------|:----------|:----|
| zfspool.vdev_health_state | online, degraded, faulted, offline, unavail, removed, suspended | state |



## Alerts


The following alerts are available:

| Alert name  | On metric | Description |
|:------------|:----------|:------------|
| [ zfs_pool_space_utilization ](https://github.com/netdata/netdata/blob/master/src/health/health.d/zfs.conf) | zfspool.pool_space_utilization | ZFS pool ${label:pool} is nearing capacity. Current space usage is above the threshold. |
| [ zfs_pool_health_state_warn ](https://github.com/netdata/netdata/blob/master/src/health/health.d/zfs.conf) | zfspool.pool_health_state | ZFS pool ${label:pool} state is degraded |
| [ zfs_pool_health_state_crit ](https://github.com/netdata/netdata/blob/master/src/health/health.d/zfs.conf) | zfspool.pool_health_state | ZFS pool ${label:pool} state is faulted or unavail |
| [ zfs_vdev_health_state ](https://github.com/netdata/netdata/blob/master/src/health/health.d/zfs.conf) | zfspool.vdev_health_state | ZFS vdev ${label:vdev} state is faulted or degraded |


## Setup


You can configure the **zfspool** collector in two ways:

| Method                | Best for                                                                                 | How to                                                                                                                                 |
|-----------------------|------------------------------------------------------------------------------------------|----------------------------------------------------------------------------------------------------------------------------------------|
| [**UI**](#via-ui)     | Fast setup without editing files                                                         | Go to **Nodes → Configure this node → Collectors → Jobs**, search for **zfspool**, then click **+** to add a job. |
| [**File**](#via-file) | If you prefer configuring via file, or need to automate deployments (e.g., with Ansible) | Edit `go.d/zfspool.conf` and add a job.                                                                        |

:::important

UI configuration requires paid Netdata Cloud plan.

:::


### Prerequisites

No action required.

### Configuration

#### Options

The following options can be defined globally: update_every.


<details open><summary>Config options</summary>



| Option | Description | Default | Required |
|:-----|:------------|:--------|:---------:|
| update_every | Data collection frequency. | 10 | no |
| binary_path | Path to the `zpool` binary. If an absolute path is provided, the collector will use it directly; otherwise, it will search for the binary in directories specified in the PATH environment variable. | /usr/bin/zpool | yes |
| timeout | Timeout for executing the binary, specified in seconds. | 2 | no |


</details>


#### via UI

Configure the **zfspool** collector from the Netdata web interface:

1. Go to **Nodes**.
2. Select the node **where you want the zfspool data-collection job to run** and click the :gear: (**Configure this node**). That node will run the data collection.
3. The **Collectors → Jobs** view opens by default.
4. In the Search box, type _zfspool_ (or scroll the list) to locate the **zfspool** collector.
5. Click the **+** next to the **zfspool** collector to add a new job.
6. Fill in the job fields, then click **Test** to verify the configuration and **Submit** to save.
    - **Test** runs the job with the provided settings and shows whether data can be collected.
    - If it fails, an error message appears with details (for example, connection refused, timeout, or command execution errors), so you can adjust and retest.


#### via File

The configuration file name for this integration is `go.d/zfspool.conf`.

The file format is YAML. Generally, the structure is:

```yaml
update_every: 1
autodetection_retry: 0
jobs:
  - name: some_name1
  - name: some_name2
```
You can edit the configuration file using the [`edit-config`](https://github.com/netdata/netdata/blob/master/docs/netdata-agent/configuration/README.md#edit-a-configuration-file-using-edit-config) script from the
Netdata [config directory](https://github.com/netdata/netdata/blob/master/docs/netdata-agent/configuration/README.md#the-netdata-config-directory).

```bash
cd /etc/netdata 2>/dev/null || cd /opt/netdata/etc/netdata
sudo ./edit-config go.d/zfspool.conf
```

##### Examples

###### Custom binary path

The executable is not in the directories specified in the PATH environment variable.

<details open><summary>Config</summary>

```yaml
jobs:
  - name: zfspool
    binary_path: /usr/local/sbin/zpool

```
</details>



## Troubleshooting

### Debug Mode

**Important**: Debug mode is not supported for data collection jobs created via the UI using the Dyncfg feature.

To troubleshoot issues with the `zfspool` collector, run the `go.d.plugin` with the debug option enabled. The output
should give you clues as to why the collector isn't working.

- Navigate to the `plugins.d` directory, usually at `/usr/libexec/netdata/plugins.d/`. If that's not the case on
  your system, open `netdata.conf` and look for the `plugins` setting under `[directories]`.

  ```bash
  cd /usr/libexec/netdata/plugins.d/
  ```

- Switch to the `netdata` user.

  ```bash
  sudo -u netdata -s
  ```

- Run the `go.d.plugin` to debug the collector:

  ```bash
  ./go.d.plugin -d -m zfspool
  ```

  To debug a specific job:

  ```bash
  ./go.d.plugin -d -m zfspool -j jobName
  ```

### Getting Logs

If you're encountering problems with the `zfspool` collector, follow these steps to retrieve logs and identify potential issues:

- **Run the command** specific to your system (systemd, non-systemd, or Docker container).
- **Examine the output** for any warnings or error messages that might indicate issues.  These messages should provide clues about the root cause of the problem.

#### System with systemd

Use the following command to view logs generated since the last Netdata service restart:

```bash
journalctl _SYSTEMD_INVOCATION_ID="$(systemctl show --value --property=InvocationID netdata)" --namespace=netdata --grep zfspool
```

#### System without systemd

Locate the collector log file, typically at `/var/log/netdata/collector.log`, and use `grep` to filter for collector's name:

```bash
grep zfspool /var/log/netdata/collector.log
```

**Note**: This method shows logs from all restarts. Focus on the **latest entries** for troubleshooting current issues.

#### Docker Container

If your Netdata runs in a Docker container named "netdata" (replace if different), use this command:

```bash
docker logs netdata 2>&1 | grep zfspool
```


